Ex vivo ( Latin for outside of the living ) refers to procedures or processes in which living biological material, in particular cells, tissues or organs taken from a living organism and is usually outside its cultivated over a limited time. This allows for a treatment and analysis of the material under controlled conditions. Examples of ex vivo method is the ex vivo gene therapy studies of the Langendorff heart and the Ex Vivo Eye Irritation Test ( EVEIT ).
In ex vivo gene therapy, for example, genes are introduced into cells taken from a subject. Then, the so modified cells are fed back to the individual so as to treat a genetic disease.